Another important motivation was the study of strange metals, the materials that lead to high temperature superconductivity. It has been proposed that this system is related to nearly extremal black holes, or black branes, with an \(AdS_2\)  near horizon geometry, which gives a new perspective on this long-standing problem. The study of
this connection has also given back interesting lessons for black holes. In particular the SYK model mentioned in the previous section [1]}, [2]}, which was originally motivated by condensed matter physics, has been very useful for identifying certain symmetries that govern the gravitational dynamics of near extremal black holes, leading to a precise quantization of the most important low energy modes, as well as their non-perturbative structure as discussed in the previous section.
